Chapter 543 Dark Matter Halo (Please Subscribe to the Genuine Version)

Listening to the description of the diamond crystal, everyone unconsciously felt the vastness of the galaxy, their own insignificance, the eternal universe, and the brevity of life.

Everyone listened to it quietly.

"Perhaps this is difficult for you, a life form that has not yet reached the sixth level of civilization, to understand intuitively. How should I put it, um" the diamond crystal paused, and saw that the warmth of its crystal-like body seemed to have changed a little, and then it continued, "Hey! Dark matter halo! Take back what I said before, it seems that your human civilization is not completely ignorant of dark matter, at least some of your conjectures about dark matter are very good."

"Dark matter halo?" Yue Yuan asked in confusion. He knew what dark matter halo was, but he didn't know what the difficulty of the long voyage that the diamond crystal was talking about had to do with dark matter halo.

The rhombus crystal did not directly answer Yue Yuan's question. It seemed to have seen something surprising and said in a rather pleasant tone: "Oh, the classic NFW distribution of the density profile of the dark matter halo, the cosmic scale density formula. The quantitative description of the aggregation formula of the dark matter halo, and the expression of the dark matter halo mass function about the random field, the dark matter halo mass growth and assembly history, the dark matter halo partiality factor, and the dark matter sub-halo mass distribution description function"

"Tsk tsk. You are really interesting! Although a lot of it is nonsense, I have to say that you are really interesting. You should know that at your level, our civilization did not even propose the concept of dark matter, but you broke out in an era."

Dark matter halo.

In human scientific literature, they are the basic components of the large-scale structure of the universe. Dark matter halos are generally located on the large-scale fibrous structure of the universe or on its nodes, and some are located in low-density void areas.

The galaxies observed by humans are often formed in the dark matter halos of these fibrous structures. Most galaxies are embedded in dark matter halos. The dynamics of galaxy systems like the Milky Way are also mainly dominated by the distribution of dark matter.

Up to now, humans still cannot determine the nature of dark matter in the Milky Way halo, but there are some candidates in some theories of related cosmic models, such as supersymmetric particles and axions.

Of course, all the related theories are nonsense in the eyes of the diamond crystal, but the scientists present can hear it, and the diamond crystal also affirms and appreciates it.

"Since you have these basics, I don't need to say more, you can understand it." As if sensing that everyone understands what he means, the voice of the diamond crystal appears again.

"You mean that each galaxy is also a dark matter island?" An astronomer came to his senses.

"Look, don't you understand it?" The diamond crystal seemed to be very pleased and gave an anthropomorphic laugh.

Then its body burst into a burst of light, which scared the scientists who were immersed in thinking, and they thought that something had happened to the diamond crystal.

But he never expected that the light did not turn into lasers, but scattered between the diamond crystal and the crowd like stars, as if countless cold fluorescent spots were gathering together. Then everyone saw that the stars disappeared, and a blue screen replaced them.

Or it would be more accurate to say that it was a 3D holographic screen.

"Holographic technology!" Zhao Youqin, a communications information scientist, couldn't help but exclaimed when he saw the holographic screen.

Humans are already at the third level of civilization, and they still use projection screens. There is no holographic technology like this that is so real that you can grab the content with your hands. Now that he sees it, how can he not be excited.

After the holographic screen appeared, everyone found that a dynamic picture of the Milky Way appeared in the holographic screen.

Yue Yuan also looked up and found that it was a rotating dynamic picture of the Milky Way, and it was obviously a dynamic picture that was accelerated. He was also surprised by the holographic screen, but he knew that the diamond crystal did this not to let everyone see the holographic screen, but to see the content inside.

He found this dynamic image very familiar. It should be that the rhombus crystal copied it from the human database for his group to see.

"Are we really living in dark matter?" A scientist said in a daze, looking at the dynamic image of the rotating Milky Way on the holographic screen.

Humans have long discovered the abnormality of the high-speed rotation of the Milky Way. Astronomers have found that the rotation speed of the stars at the edge of the Milky Way is far beyond expectations.

According to Newton's classical mechanics, it stands to reason that the orbital speed of a celestial body should decrease as its distance from the center increases. This is because objects farther away are less affected by the central gravity and should have a lower orbital speed.

However, astronomers have found through observations of stars at the edge of the Milky Way that the orbital speed of these stars has not decreased significantly, but is similar to that of stars close to the center of the Milky Way, and even almost the same in some cases. This undoubtedly violates the expectations of traditional physics, so it will lead to a question, that is, what makes the Milky Way rotate so fast and evenly?

Since the traditional theory of universal gravitation cannot explain it, human scientists introduced dark matter after a long period of research. It is believed that in addition to visible stars, gas, and dust, the Milky Way must also have a large amount of unknown mass, which provides additional gravity for the rotation of the Milky Way.

The reason why the Milky Way does not fall apart during its rotation is because the gravity provided by these dark matter holds the entire Milky Way together.

In the Earth era, some scientists believed that galaxies like the Milky Way were shrouded in a huge dark matter fog.

Later, astronomers conducted similar observations on the Andromeda Galaxy, and the results showed that the orbital speed of stars at the edge of the Andromeda Galaxy was also higher than the expected speed calculated based on visible matter.

This shows that high-speed rotation is not unique to the Milky Way, but a universal phenomenon. This is true for the Andromeda Galaxy and other distant galaxies. It is a common feature of many galaxies in the universe and a universal cosmic phenomenon.

Then it is obvious that the rhombus crystal showed this picture to everyone present, just to tell humans that your conjecture is correct. The reason why the Milky Way rotates like this is because there is a lot of dark matter.

So what does this have to do with the difficulty of long-distance voyages?

The answer is also simple. Dark matter provides gravity, and where is the strongest source of gravity in the Milky Way? It is the Milky Way's center black hole.

In other words, the light and dark matter of the Milky Way have jointly formed its appearance, and because of the gravitational effect of dark matter, it is concentrated in each galaxy, and the farther away from the galaxy, the thinner it is.

The iconic technology of the sixth-level civilization is the dark matter-related technology tree. If the sixth-level civilization leaves the Milky Way, it will be like leaving the lower-level civilization that leaves the stars, planets and other materials to provide resources and energy. It will be difficult to move in the interstellar space, and may even go to areas where there is no way to replenish energy.

At that time, it will really perish on the route.

You must know that the navigation technology of the sixth-level civilization is warp navigation.

Although humans have not mastered warp navigation, they have learned something after the last contact with the awakener. Warp navigation is different from conventional navigation with inertial uniform speed. It must have a continuous supply of energy to continue.

No wonder the rhombus crystal said that it itself did not know how far the pioneer civilization could go.

Everyone who thought it through was silent, and a sense of despair facing the vastness of the universe arose spontaneously. They felt extremely depressed in their hearts, and the deep space claustrophobia that had not appeared for a long time emerged again.

When staring at the bright stars again, the uncanny valley effect suddenly appeared, and it felt that the stars seemed to have lost their color and became extremely lonely. Behind the stars seemed to be a dark abyss, an abyss that swallowed all life.

This endless sea of ​​stars and vast universe is so vast that it is suffocating and despairing!

At this moment, everyone felt a chill, and they all deeply felt the malice of the universe, which was the malice of the universe itself towards life on an infinite scale.